Slab joint structure of steel plate concrete construction and slab joint method of steel plate concrete structure used therefor

Abstract

To provide a slab joint structure of a steel plate concrete construction capable of avoiding the risk of falling of a half steel plate concrete slab when an unexpectedly large upward external force is applied to the half steel plate concrete slab, and easily applicable even to an existing building.SOLUTION: In a slab joint structure of a steel plate concrete construction for joining a steel plate concrete wall 10 and a half steel plate concrete slab 20 provided with a slab steel plate 21 only at a bottom part, an upper shear plate 2 abutting on a slab upper end 20A of the half steel plate concrete slab 20 is joined to the steel plate concrete wall 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a slab joining structure of a steel plate concrete structure for joining a steel plate concrete wall and a half steel plate concrete slab provided with a slab steel plate only at the bottom, and a method for joining a slab of a steel plate concrete structure used therefor.

Background Art

[0002] As the background art of the present invention, for example, there is a joining structure between a steel plate concrete wall and a slab in which a bracket (lower shear plate) for receiving and supporting a slab steel plate of a slab (half steel plate concrete slab) is provided on the steel plate concrete wall (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, when an external force in the out-of-plane direction (vertical direction) is generated in the half steel plate concrete slab due to the occurrence of an earthquake or the like, the downward external force can be favorably transmitted to the steel plate concrete wall by the shear strength of the bracket because the direction is the receiving direction of the half steel plate concrete slab by the bracket.

[0005] However, since the upward external force is in the direction of peeling of the half - steel - plate concrete slab with respect to the bracket, it becomes difficult for the transfer to the steel - plate concrete wall by the shear strength of the bracket. Therefore, when an unexpectedly large upward external force is generated in the half - steel - plate concrete slab due to the occurrence of an unexpected large earthquake or the like, there is a risk that the end of the half - steel - plate concrete slab will come off the bracket and the half - steel - plate concrete slab will fall off.

[0006] Also, in an existing building made of steel - plate concrete, when an out - of - plane external force is generated in the half - steel - plate concrete slab due to the occurrence of an earthquake or the like, there are similar problems due to the upward external force. Therefore, it is desired to improve the shear strength against the upward external force by renovation.

[0007] In view of this situation, the main problem of the present invention is to provide a slab joint structure of a steel - plate concrete structure that can avoid the risk of the half - steel - plate concrete slab falling off when an unexpectedly large upward external force is generated in the half - steel - plate concrete slab and can be easily applied to existing buildings.

Means for Solving the Problem

[0008] A first characteristic configuration of the present invention is a slab joint structure of a steel - plate concrete structure that joins a steel - plate concrete wall and a half - steel - plate concrete slab provided with a slab steel plate only at the bottom, wherein an upper shear plate that abuts on the upper end of the slab of the half - steel - plate concrete slab is joined to the steel - plate concrete wall.

[0009] According to this configuration, when an upward external force is generated in the half - steel - plate concrete slab due to the occurrence of an earthquake or the like, since the direction of the upward external force is the receiving direction of the half - steel - plate concrete slab by the upper shear plate, it can be favorably transmitted from the half - steel - plate concrete slab to the steel - plate concrete wall by the shear strength of the upper shear plate.

[0010] In particular, since the upper shear plate abuts against the upper end of the slab of the half steel plate concrete slab, in an existing general steel plate concrete building where such a shear plate is often not provided, the upper shear plate can be easily retrofitted. And by retrofitting the upper shear plate, when an upward external force is generated on the half steel plate concrete slab due to the occurrence of an earthquake or the like, this upward external force can be well transmitted from the half steel plate concrete slab to the steel plate concrete wall by the shear resistance of the retrofitted upper shear plate.

[0011] Thereby, for example, when an unexpectedly large upward external force is generated on the half steel plate concrete slab due to the occurrence of an unexpectedly large earthquake or the like, regardless of whether it is a newly constructed building or an existing building, the upward external force can be well transmitted from the half steel plate concrete slab to the steel plate concrete wall by the shear resistance of the upper shear plate.

[0012] As a result, even when an unexpectedly large upward external force is generated on the half steel plate concrete slab, regardless of whether it is a newly constructed building or an existing building, it is possible to avoid the risk that the end of the half steel plate concrete slab comes off from the lower shear plate and the half steel plate concrete slab falls off.

[0013] The second characteristic configuration of the present invention is that a lower shear plate for receiving and supporting the slab steel plate from below is joined to the steel plate concrete wall. The upper shear plate and the lower shear plate are connected via bolts passing through the half steel plate concrete slab in the vertical direction and extending between the upper shear plate and the lower shear plate.

[0014] According to this configuration, when an external force in the out-of-plane direction (vertical direction) is generated on the half steel plate concrete slab due to the occurrence of an earthquake or the like, the downward external force is received by the lower shear plate and transmitted from the lower shear plate to the upper shear plate via bolts, so that it can be received by the upper shear plate. Also, the upward external force is received by the upper shear plate and transmitted from the upper shear plate to the lower shear plate via bolts, so that it can be received by the lower shear plate.

[0015] That is, when a downward external force is generated on the half steel plate concrete slab, the shear strength of the lower shear plate can be complemented by the shear strength of the upper shear plate. Conversely, when an upward external force is generated on the half steel plate concrete slab, the shear strength of the upper shear plate can be complemented by the shear strength of the lower shear plate.

[0016] As a result, when an unexpectedly large out-of-plane external force is generated on the half steel plate concrete slab, the lower shear plate and the upper shear plate complement each other, so that regardless of whether it is a new building or an existing building, the risk of the end of the half steel plate concrete slab coming off from the lower shear plate and the half steel plate concrete slab falling off can be more reliably avoided.

[0017] The third characteristic configuration of the present invention is a slab joining method for a steel plate concrete structure used in the slab joining structure of the steel plate concrete structure described in the above first or second characteristic configuration, which is characterized in that after laying the slab steel plate with the end portion of the slab steel plate placed on the lower shear plate joined to the steel plate concrete wall, the upper shear plate is joined to the steel plate concrete wall.

[0018] According to this configuration, when laying the slab steel plate by placing the end of the slab steel plate on the lower shear plate on the side of the steel plate concrete wall, since the upper shear plate is not joined to the steel plate concrete wall, the laying of the slab steel plate can be carried out promptly without being hindered by the upper shear plate. As a result, the workability when laying the slab steel plate can be improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0020] Hereinafter, an example of a mode for carrying out the present invention will be described based on the drawings.

[0021] As shown in FIG. 1, in the slab joint structure of the steel plate concrete structure exemplified in the present embodiment, a steel plate concrete wall (hereinafter referred to as an SC wall) 10 and a half steel plate concrete slab (hereinafter referred to as a half SC slab) 20 are joined so as to be able to transmit each shear force in the out-of-plane direction (vertical direction) and in-plane direction (horizontal direction) of the half SC slab 20 to the SC wall 10.

[0022] As shown in FIGS. 1 to 3, the SC wall 10 is constructed by placing wall concrete 12 (see FIG. 1) between a pair of wall steel plates 11 forming its wall surface. The pair of wall steel plates 11 are connected via a number of tie bars 13 or the like having a certain length and spanning the pair of wall steel plates 11, thereby securing a wall concrete placement area 14 at regular intervals between the pair of wall steel plates 11. On the inner surface of each wall steel plate 11, a number of studs 15 for structurally integrating the wall steel plate 11 and the wall concrete 12 are welded and joined in a horizontal posture.

[0023] The half SC slab 20 is a steel plate concrete slab provided with a slab steel plate 21 replacing the lower end reinforcement only at its bottom. The half SC slab 20 is constructed by laying the slab steel plate 21 forming the bottom surface of the half SC slab 20 in the slab construction area A surrounded by the SC wall 10, then arranging a number of upper end reinforcements 22 in a grid pattern, and placing slab concrete 23 (see FIG. 1). On the upper surface of the slab steel plate 21, a number of studs 24 for structurally integrating the slab steel plate 21 and the slab concrete 23 are welded and joined in an upright posture. Each upper end reinforcement 22 is bent in an L shape so that their ends function as fixing portions 22A fixed within the SC wall 10.

[0024] At the joint portion between the SC wall 10 and the half SC slab 20, a lower shear plate 1 for receiving and supporting the end of the slab steel plate 21 in the half SC slab 20 from below and an upper shear plate 2 abutting against the slab upper end 20A of the outer peripheral portion in the half SC slab 20 are provided. The lower shear plate 1 is welded and joined at the receiving height position of the slab steel plate 21 in the wall steel plate 11 facing the slab construction area A. The upper shear plate 2 is bolted and joined at the abutting height position with the slab upper end 20A of the half SC slab 20 in the wall steel plate 11 facing the slab construction area A.

[0025] In the present embodiment, as a slab joint structure of a steel plate concrete structure, an example is given in which the lower shear plate 1 is welded to the wall steel plate 11 of the SC wall 10. However, the present invention is not limited to this. For example, the lower shear plate 1 may be bolted to the wall steel plate 11 of the SC wall 10. Further, an example is given in which the upper shear plate 2 is bolted to the wall steel plate 11 of the SC wall 10. However, the present invention is not limited to this. For example, the upper shear plate 2 may be welded to the wall steel plate 11 of the SC wall 10.

[0026] At the joint portion of the wall steel plate 11 facing the slab construction area A with the half SC slab 20, a plurality of joint portions 11a enabling bolt connection of the upper shear plate 2 by bolts 3 etc. and a number of through holes 11b through which the ends of the upper end reinforcing bars 22 are passed are provided. Incidentally, the joint portion 11a may be, for example, a through hole or a screw hole formed in the wall steel plate 11 of the SC wall 10, or may be a through hole in the wall steel plate 11 and a nut welded to the wall steel plate 11.

[0027] The upper shear plate 2 is formed in an L shape in side view, having a contact portion 2A extending horizontally along the SC wall 10 in a horizontal posture in contact with the slab upper end 20A of the half SC slab 20, and a joint portion 2B rising from one end of the contact portion 2A in a vertical posture in surface contact with the SC wall 10. In the joint portion 2B, a plurality of through holes 2a (see FIG. 2) enabling bolt connection with the wall steel plate 11 facing the slab construction area A by bolts 3 etc. are formed. The plurality of through holes 2a are arranged at predetermined intervals in the extending direction of the joint portion 2B.

[0028] As described above, in the slab joint structure of the steel plate concrete construction exemplified in this embodiment, the lower shear plate 1 and the upper shear plate 2 described above are joined at the joint portion of the SC wall 10 with the half SC slab 20. Thus, when an external force in the out-of-plane direction (vertical direction) is generated in the half SC slab 20 due to an earthquake or the like, the downward external force can be favorably transmitted from the half SC slab 20 to the SC wall 10 by the shear strength of the lower shear plate 1 because the direction thereof is the receiving direction of the half SC slab 20 by the lower shear plate 1. Also, the upward external force can be favorably transmitted from the half SC slab 20 to the SC wall 10 by the shear strength of the upper shear plate 2 because the direction thereof is the receiving direction of the half SC slab 20 by the upper shear plate 2.

[0029] Moreover, since the upper shear plate 2 abuts against the slab upper end 20A of the half SC slab 20, in an existing general steel plate concrete building where such a shear plate is often not provided, the upper shear plate 2 can be easily retrofitted. And by retrofitting the upper shear plate 2, when an upward external force is generated in the half SC slab 20 due to an earthquake or the like, this upward external force can be favorably transmitted from the half SC slab 20 to the SC wall 10 by the shear strength of the retrofitted upper shear plate 2.

[0030] Thus, for example, when an unexpectedly large upward external force is generated in the half SC slab 20 due to the occurrence of an unexpectedly large earthquake or the like, regardless of whether it is a new building or an existing building, the upward external force can be favorably transmitted from the half SC slab 20 to the SC wall 10 by the shear strength of the upper shear plate 2.

[0031] As a result, even when an unexpectedly large upward external force is generated in the half SC slab 20, it is possible to avoid the risk that the end portion of the half SC slab 20 comes off from the lower shear plate 1 and the half SC slab 20 drops off.

[0032] Hereinafter, in a newly constructed building to which the slab joint structure of a steel plate concrete structure exemplified in this embodiment is applied, the construction procedure for joining the SC wall 10 and the half SC slab 20 will be described. Incidentally, here, the description will start from the stage where a pair of wall steel plates 11 in the SC wall 10 are built in and the slab construction area A is formed. And at this stage, the lower shear plate 1 has already been welded and joined at the receiving height position of the slab steel plate 21 in the wall steel plate 11 facing the slab construction area A.

[0033] As a construction procedure, as shown in FIG. 2, first, the end of the slab steel plate 21 is placed on the lower shear plate 1 welded and joined to the wall steel plate 11 of the SC wall 10, and the slab steel plate 21 is laid in the slab construction area A. And at this laying stage, the end of the slab steel plate 21 is welded and joined to the lower shear plate 1 by fillet welding or the like. After finishing the laying of the slab steel plate 21 in the slab construction area A, a large number of upper end reinforcing bars 22 are arranged in a grid pattern in the slab construction area A while passing their ends through the through holes 11b of the wall steel plate 11 so that their ends are located inside the SC wall 10. After finishing the arrangement of the upper end reinforcing bars 22 in the slab construction area A, as shown in FIGS. 2 to 3, the upper shear plate 2 is bolted and joined to the contact height position with the slab upper end 20A of the half SC slab 20 in the wall steel plate 11 facing the slab construction area A using bolts 3 or the like.

[0034] In this way, after laying the slab steel plate 21 and arranging the upper end reinforcing bars 22 in the slab construction area A, by bolt-joining the upper shear plate 2 to the wall steel plate 11, the laying of the slab steel plate 21 and the arrangement of the upper end reinforcing bars 22 can be promptly carried out without being obstructed by the upper shear plate 2, and the workability can be improved.

[0035] After finishing the bolt connection of the upper shear plate 2 to the wall steel plate 11, as shown in Fig. 1, the wall concrete 12 is placed in the wall concrete placement area 14 between the pair of wall steel plates 11 in the SC wall 10 to construct the SC wall 10. Also, on the slab steel plate 21 of the half SC slab 20 in the slab construction area A, the slab concrete 23 is placed up to the bottom height position of the contact portion 2A in the upper shear plate 2 to construct the half SC slab 20.

[0036] That is, in a newly constructed building, by constructing the SC wall 10 and the half SC slab 20 in the above construction procedure, the SC wall 10 and the half SC slab 20 can be reasonably joined in a suitable state where the risk of the half SC slab 20 falling off due to the occurrence of an unexpectedly large earthquake or the like is avoided.

[0037] Next, although not shown in the drawings, the construction procedure for the case of retrofitting an existing building where the slab joint structure of the steel plate concrete structure exemplified in this embodiment is not applied to a state where the slab joint structure of the steel plate concrete structure exemplified in this embodiment is applied will be described.

[0038] As the construction procedure, first, using a drill or the like, a plurality of pilot holes for bolt connection are formed at the joint portion of the SC wall 10 of the existing building with the half SC slab 20 at the contact height position with the slab upper end 20A of the half SC slab 20 in the SC wall 10 for the upper shear plate 2. After forming the pilot holes, using a post-installed anchor or the like to be inserted into these pilot holes, with the bottom surface of the contact portion 2A in the upper shear plate 2 in contact with the slab upper end 20A of the half SC slab 20, the upper shear plate 2 is joined to the SC wall 10.

[0039] That is, in an existing building, by performing the retrofitting of attaching the upper shear plate 2 to the SC wall 10 in the above construction procedure, the SC wall 10 and the half SC slab 20 can be reasonably joined in a suitable state where the risk of the half SC slab 20 falling off due to the occurrence of an unexpectedly large earthquake or the like is avoided.

[0040] 〔Alternative Embodiment〕 An alternative embodiment of the present invention will be described. Note that the configurations of the respective alternative embodiments described below are not limited to being applied independently, and can also be applied in combination with the configurations of the above-described embodiment and other alternative embodiments.

[0041] (1) As a slab joint structure of a steel plate concrete structure according to the present invention, as shown in FIG. 4, the lower shear plate 1 and the upper shear plate 2 may be connected through a long bolt 4 or the like that penetrates the half SC slab 20 in the vertical direction and extends between the lower shear plate 1 and the upper shear plate 2.

[0042] According to this configuration, when an external force in the out-of-plane direction (vertical direction) is generated in the half SC slab 20 due to an earthquake or the like, the downward external force is received by the lower shear plate 1 and transmitted from the lower shear plate 1 to the upper shear plate 2 through the bolt 4 or the like, so that it can be received by the upper shear plate 2. Also, the upward external force is received by the upper shear plate 2 and transmitted from the upper shear plate 2 to the lower shear plate 1 through the bolt 4 or the like, so that it can be received by the lower shear plate 1.

[0043] That is, when a downward external force is generated in the half SC slab 20, the shear strength of the lower shear plate 1 can be complemented by the shear strength of the upper shear plate 2. Conversely, when an upward external force is generated in the half SC slab 20, the shear strength of the upper shear plate 2 can be complemented by the shear strength of the lower shear plate 1.

[0044] As a result, when an unexpectedly large out-of-plane external force is generated in the half SC slab 20, the lower shear plate 1 and the upper shear plate 2 complement each other, so that regardless of whether it is a newly constructed building or an existing building, the risk of the end of the half SC slab 20 coming off from the lower shear plate 1 and the half SC slab 20 falling off can be more reliably avoided.

[0045] In the case of construction procedures in this situation, if the building is a newly constructed building, first, as described with reference to FIGS. 2 to 3 in the above embodiment, the slab steel plate 21 is laid in the slab construction area A, and after arranging the upper end reinforcing bars 22, the upper shear plate 2 is bolted to the wall steel plate 11.

[0045] And after the upper shear plate 2 is bolted to the wall steel plate 11, as shown in FIG. 5(a), bolts 4 are passed through the through holes 1a, 2b, 21a for connecting the shear plates formed in the lower shear plate 1, the upper shear plate 2, and the slab steel plate 21 respectively, and the lower shear plate 1 and the upper shear plate 2 are connected via bolts 4 and the like. Thereafter, as described with reference to FIG. 1 in the above embodiment, the wall concrete 12 is placed in the wall concrete placement area 14 between the pair of wall steel plates 11 in the SC wall 10 to construct the SC wall 10. Also, on the slab steel plate 21 of the half SC slab 20 in the slab construction area A, the slab concrete 23 is placed up to the bottom height position of the contact portion 2A in the upper shear plate 2 to construct the half SC slab 20.

[0046] That is, in a newly constructed building, by constructing the SC wall 10 and the half SC slab 20 with the above construction procedures, the SC wall 10 and the half SC slab 20 can be reasonably joined in a preferable state where the possibility of the half SC slab 20 falling off due to the occurrence of an unexpected large earthquake or the like is more reliably avoided.

[0047] On the other hand, if the building is the above-mentioned existing building, as shown in FIG. 5(b), first, using a drill (not shown) or the like, through holes 1b, 21b, 23a for connecting the shear plates are formed in the lower shear plate 1, the slab steel plate 21, and the slab concrete 23 respectively. Also, in the joint portion of the SC wall 10 of the existing building with the half SC slab 20, a plurality of pilot holes 10a for bolt-joining the upper shear plate 2 at the contact height position with the slab upper end 20A of the half SC slab 20 in the SC wall 10 are formed. After forming the pilot holes 10a, the bottom surface of the contact portion 2A on the upper shear plate 2 is brought into contact with the upper end 20A of the slab of the half SC slab 20 using construction anchors 5 or the like inserted into these pilot holes 10a. Then, with the through holes 2b for connecting the shear plates formed in the contact portion 2A of the upper shear plate 2 aligned with the through holes 23a of the slab concrete 23, the upper shear plate 2 is joined to the SC wall 10. Thereafter, a long bolt 4 is passed through the through holes 1b, 2b, 21b, and 23a of the lower shear plate 1, the upper shear plate 2, the slab steel plate 21, and the slab concrete 23, and the lower shear plate 1 and the upper shear plate 2 are connected via the bolt 4 or the like.

[0048] That is, in an existing building, by retrofitting the upper shear plate 2 to the SC wall 10 according to the above construction procedure and connecting the lower shear plate 1 and the upper shear plate 2 via the bolt 4 or the like, the SC wall 10 and the half SC slab 20 can be rationally joined in a preferable state where the risk of the half SC slab 20 falling off due to the occurrence of an unexpected large earthquake or the like is more reliably avoided.

Explanation of Reference Numerals

[0049] 1 Lower shear plate 2 Upper shear plate 4 Bolt 10 Steel plate concrete wall 20 Half steel plate concrete slab 20A Upper end of slab 21 Slab steel plate

Claims

1. A slab joint structure of a steel plate concrete structure that joins a steel plate concrete wall and a half steel plate concrete slab provided with a slab steel plate only at the bottom, wherein an upper shear plate that abuts against the upper end of the slab of the half steel plate concrete slab is joined to the steel plate concrete wall. The slab joint structure of the steel plate concrete structure.

2. A lower shear plate that receives and supports the slab steel plate from below is joined to the steel plate concrete wall, and the upper shear plate and the lower shear plate are connected via bolts that penetrate the half steel plate concrete slab in the vertical direction and extend between the upper shear plate and the lower shear plate. The slab joint structure of the steel plate concrete structure according to Claim 1.

3. A slab joint method of a steel plate concrete structure used for the slab joint structure of the steel plate concrete structure according to Claim 1 or 2, wherein after laying the slab steel plate with the end portion of the slab steel plate placed on the lower shear plate joined to the steel plate concrete wall, the upper shear plate is joined to the steel plate concrete wall. The slab joint method of the steel plate concrete structure.

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